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annotate Python/thread_pthread.h @ 29972:a408ac5527c3 legacy-trunk

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Patch 775605: Cygwin pthread_sigmask() workaround patch Cygwin's pthread_sigmask() implementation appears to be buggy. This patch works around this problem by using sigprocmask() instead. This patch is implemented in a general way so it could be used by other platforms too. If this approach is deemed too risky, then I can work up a patch that just hacks Python/thread_pthread.h for Cygwin. Note that I tested this patch against 2.3c1 under Red Hat Linux 8.0 too. [snip] And finally, I need someone to regenerate pyconfig.h.in and configure with the same versions of the autotools that are normally used by Python. Neal kindly regenerated pyconfig.h.in and configure for me.
author Jason Tishler <jason@tishler.net>
date Tue, 22 Jul 2003 15:20:49 +0000
parents 40d287c3d906
children 4c8160088b34
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1
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2 /* Posix threads interface */
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3
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4 #include <stdlib.h>
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5 #include <string.h>
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6 #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
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7 #define destructor xxdestructor
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8 #endif
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9 #include <pthread.h>
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10 #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
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11 #undef destructor
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12 #endif
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13 #include <signal.h>
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14
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15 /* The POSIX spec says that implementations supporting the sem_*
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16 family of functions must indicate this by defining
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17 _POSIX_SEMAPHORES. */
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18 #ifdef _POSIX_SEMAPHORES
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19 #include <semaphore.h>
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20 #include <errno.h>
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21 #endif
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23
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24 /* try to determine what version of the Pthread Standard is installed.
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25 * this is important, since all sorts of parameter types changed from
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26 * draft to draft and there are several (incompatible) drafts in
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27 * common use. these macros are a start, at least.
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28 * 12 May 1997 -- david arnold <davida@pobox.com>
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29 */
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31 #if defined(__ultrix) && defined(__mips) && defined(_DECTHREADS_)
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32 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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33 # define PY_PTHREAD_D4
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34 # error Systems with PY_PTHREAD_D4 are unsupported. See README.
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36 #elif defined(__osf__) && defined (__alpha)
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37 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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38 # if !defined(_PTHREAD_ENV_ALPHA) || defined(_PTHREAD_USE_D4) || defined(PTHREAD_USE_D4)
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39 # define PY_PTHREAD_D4
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40 # error Systems with PY_PTHREAD_D4 are unsupported. See README.
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41 # else
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42 # define PY_PTHREAD_STD
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43 # endif
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44
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45 #elif defined(_AIX)
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46 /* SCHED_BG_NP is defined if using AIX DCE pthreads
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47 * but it is unsupported by AIX 4 pthreads. Default
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48 * attributes for AIX 4 pthreads equal to NULL. For
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49 * AIX DCE pthreads they should be left unchanged.
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50 */
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51 # if !defined(SCHED_BG_NP)
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52 # define PY_PTHREAD_STD
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53 # else
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54 # define PY_PTHREAD_D7
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55 # error Systems with PY_PTHREAD_D7 are unsupported. See README.
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56 # endif
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57
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58 #elif defined(__DGUX)
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59 # define PY_PTHREAD_D6
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60 # error Systems with PY_PTHREAD_D6 are unsupported. See README.
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61
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62 #elif defined(__hpux) && defined(_DECTHREADS_)
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63 # define PY_PTHREAD_D4
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64 # error Systems with PY_PTHREAD_D4 are unsupported. See README.
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66 #else /* Default case */
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67 # define PY_PTHREAD_STD
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69 #endif
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70
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71 #ifdef USE_GUSI
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72 /* The Macintosh GUSI I/O library sets the stackspace to
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73 ** 20KB, much too low. We up it to 64K.
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74 */
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75 #define THREAD_STACK_SIZE 0x10000
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76 #endif
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77
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78
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79 /* set default attribute object for different versions */
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80
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81 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D7)
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82 #if !defined(pthread_attr_default)
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83 # define pthread_attr_default pthread_attr_default
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84 #endif
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85 #if !defined(pthread_mutexattr_default)
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86 # define pthread_mutexattr_default pthread_mutexattr_default
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87 #endif
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88 #if !defined(pthread_condattr_default)
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89 # define pthread_condattr_default pthread_condattr_default
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90 #endif
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91 #elif defined(PY_PTHREAD_STD) || defined(PY_PTHREAD_D6)
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92 #if !defined(pthread_attr_default)
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93 # define pthread_attr_default ((pthread_attr_t *)NULL)
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94 #endif
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95 #if !defined(pthread_mutexattr_default)
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96 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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97 #endif
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98 #if !defined(pthread_condattr_default)
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99 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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100 #endif
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101 #endif
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103
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104 /* Whether or not to use semaphores directly rather than emulating them with
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105 * mutexes and condition variables:
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106 */
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107 #if defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES)
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108 # define USE_SEMAPHORES
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109 #else
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110 # undef USE_SEMAPHORES
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111 #endif
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112
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113
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114 /* On platforms that don't use standard POSIX threads pthread_sigmask()
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115 * isn't present. DEC threads uses sigprocmask() instead as do most
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116 * other UNIX International compliant systems that don't have the full
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117 * pthread implementation.
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118 */
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119 #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
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120 # define SET_THREAD_SIGMASK pthread_sigmask
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121 #else
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122 # define SET_THREAD_SIGMASK sigprocmask
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123 #endif
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124
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125
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126 /* A pthread mutex isn't sufficient to model the Python lock type
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127 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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128 * following are undefined:
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129 * -> a thread tries to lock a mutex it already has locked
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130 * -> a thread tries to unlock a mutex locked by a different thread
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131 * pthread mutexes are designed for serializing threads over short pieces
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132 * of code anyway, so wouldn't be an appropriate implementation of
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133 * Python's locks regardless.
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134 *
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135 * The pthread_lock struct implements a Python lock as a "locked?" bit
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136 * and a <condition, mutex> pair. In general, if the bit can be acquired
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137 * instantly, it is, else the pair is used to block the thread until the
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138 * bit is cleared. 9 May 1994 tim@ksr.com
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139 */
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140
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141 typedef struct {
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142 char locked; /* 0=unlocked, 1=locked */
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143 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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144 pthread_cond_t lock_released;
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145 pthread_mutex_t mut;
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146 } pthread_lock;
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147
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148 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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149
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150 /*
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151 * Initialization.
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152 */
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153
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154 #ifdef _HAVE_BSDI
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155 static
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156 void _noop(void)
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157 {
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158 }
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159
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160 static void
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161 PyThread__init_thread(void)
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162 {
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163 /* DO AN INIT BY STARTING THE THREAD */
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164 static int dummy = 0;
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165 pthread_t thread1;
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166 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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167 pthread_join(thread1, NULL);
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168 }
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169
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170 #else /* !_HAVE_BSDI */
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171
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172 static void
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173 PyThread__init_thread(void)
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174 {
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175 #if defined(_AIX) && defined(__GNUC__)
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176 pthread_init();
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177 #endif
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178 }
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179
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180 #endif /* !_HAVE_BSDI */
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181
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182 /*
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183 * Thread support.
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184 */
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185
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186
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187 long
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188 PyThread_start_new_thread(void (*func)(void *), void *arg)
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189 {
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190 pthread_t th;
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191 int status;
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192 sigset_t oldmask, newmask;
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193 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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194 pthread_attr_t attrs;
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195 #endif
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196 dprintf(("PyThread_start_new_thread called\n"));
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197 if (!initialized)
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198 PyThread_init_thread();
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199
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200 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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201 pthread_attr_init(&attrs);
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202 #endif
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203 #ifdef THREAD_STACK_SIZE
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204 pthread_attr_setstacksize(&attrs, THREAD_STACK_SIZE);
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205 #endif
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206 #ifdef PTHREAD_SYSTEM_SCHED_SUPPORTED
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207 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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208 #endif
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209
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210 /* Mask all signals in the current thread before creating the new
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211 * thread. This causes the new thread to start with all signals
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212 * blocked.
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213 */
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214 sigfillset(&newmask);
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215 SET_THREAD_SIGMASK(SIG_BLOCK, &newmask, &oldmask);
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216
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217 status = pthread_create(&th,
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218 #if defined(PY_PTHREAD_D4)
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219 pthread_attr_default,
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220 (pthread_startroutine_t)func,
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221 (pthread_addr_t)arg
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222 #elif defined(PY_PTHREAD_D6)
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223 pthread_attr_default,
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224 (void* (*)(void *))func,
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225 arg
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226 #elif defined(PY_PTHREAD_D7)
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227 pthread_attr_default,
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228 func,
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229 arg
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230 #elif defined(PY_PTHREAD_STD)
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231 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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232 &attrs,
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233 #else
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234 (pthread_attr_t*)NULL,
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235 #endif
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236 (void* (*)(void *))func,
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237 (void *)arg
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238 #endif
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239 );
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240
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241 /* Restore signal mask for original thread */
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242 SET_THREAD_SIGMASK(SIG_SETMASK, &oldmask, NULL);
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243
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244 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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245 pthread_attr_destroy(&attrs);
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246 #endif
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247 if (status != 0)
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248 return -1;
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249
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250 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D6) || defined(PY_PTHREAD_D7)
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251 pthread_detach(&th);
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252 #elif defined(PY_PTHREAD_STD)
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253 pthread_detach(th);
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254 #endif
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255
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256 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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257 return (long) th;
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258 #else
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259 return (long) *(long *) &th;
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260 #endif
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261 }
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262
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263 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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264 hosed" because:
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265 - It does not guanrantee the promise that a non-zero integer is returned.
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266 - The cast to long is inherently unsafe.
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267 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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268 latter return statement (for Alpha OSF/1) are any longer necessary.
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269 */
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270 long
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271 PyThread_get_thread_ident(void)
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272 {
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273 volatile pthread_t threadid;
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274 if (!initialized)
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275 PyThread_init_thread();
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276 /* Jump through some hoops for Alpha OSF/1 */
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277 threadid = pthread_self();
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278 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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279 return (long) threadid;
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280 #else
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281 return (long) *(long *) &threadid;
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282 #endif
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283 }
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284
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285 static void
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286 do_PyThread_exit_thread(int no_cleanup)
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287 {
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288 dprintf(("PyThread_exit_thread called\n"));
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289 if (!initialized) {
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290 if (no_cleanup)
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291 _exit(0);
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292 else
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293 exit(0);
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294 }
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295 }
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296
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297 void
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298 PyThread_exit_thread(void)
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299 {
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300 do_PyThread_exit_thread(0);
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301 }
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302
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303 void
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304 PyThread__exit_thread(void)
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305 {
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306 do_PyThread_exit_thread(1);
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307 }
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308
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309 #ifndef NO_EXIT_PROG
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310 static void
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311 do_PyThread_exit_prog(int status, int no_cleanup)
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312 {
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313 dprintf(("PyThread_exit_prog(%d) called\n", status));
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314 if (!initialized)
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315 if (no_cleanup)
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316 _exit(status);
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317 else
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318 exit(status);
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319 }
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320
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321 void
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322 PyThread_exit_prog(int status)
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323 {
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324 do_PyThread_exit_prog(status, 0);
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325 }
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326
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327 void
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328 PyThread__exit_prog(int status)
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329 {
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330 do_PyThread_exit_prog(status, 1);
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331 }
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332 #endif /* NO_EXIT_PROG */
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333
22339
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334 #ifdef USE_SEMAPHORES
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335
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336 /*
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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337 * Lock support.
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338 */
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339
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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340 PyThread_type_lock
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341 PyThread_allocate_lock(void)
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342 {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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343 sem_t *lock;
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344 int status, error = 0;
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345
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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346 dprintf(("PyThread_allocate_lock called\n"));
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diff changeset
347 if (!initialized)
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diff changeset
348 PyThread_init_thread();
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349
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350 lock = (sem_t *)malloc(sizeof(sem_t));
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351
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352 if (lock) {
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353 status = sem_init(lock,0,1);
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354 CHECK_STATUS("sem_init");
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355
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diff changeset
356 if (error) {
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diff changeset
357 free((void *)lock);
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358 lock = NULL;
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359 }
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360 }
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361
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362 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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363 return (PyThread_type_lock)lock;
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364 }
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365
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366 void
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367 PyThread_free_lock(PyThread_type_lock lock)
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368 {
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369 sem_t *thelock = (sem_t *)lock;
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370 int status, error = 0;
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371
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372 dprintf(("PyThread_free_lock(%p) called\n", lock));
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373
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diff changeset
374 if (!thelock)
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375 return;
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376
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377 status = sem_destroy(thelock);
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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diff changeset
378 CHECK_STATUS("sem_destroy");
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diff changeset
379
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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diff changeset
380 free((void *)thelock);
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381 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
382
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
383 /*
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
384 * As of February 2002, Cygwin thread implementations mistakenly report error
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
385 * codes in the return value of the sem_ calls (like the pthread_ functions).
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
386 * Correct implementations return -1 and put the code in errno. This supports
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
387 * either.
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
388 */
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
389 static int
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
390 fix_status(int status)
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
391 {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
392 return (status == -1) ? errno : status;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
393 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
394
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
395 int
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
396 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
397 {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
398 int success;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
399 sem_t *thelock = (sem_t *)lock;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
400 int status, error = 0;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
401
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
402 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
403
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
404 do {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
405 if (waitflag)
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
406 status = fix_status(sem_wait(thelock));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
407 else
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
408 status = fix_status(sem_trywait(thelock));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
409 } while (status == EINTR); /* Retry if interrupted by a signal */
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
410
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
411 if (waitflag) {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
412 CHECK_STATUS("sem_wait");
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
413 } else if (status != EAGAIN) {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
414 CHECK_STATUS("sem_trywait");
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
415 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
416
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
417 success = (status == 0) ? 1 : 0;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
418
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
419 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
420 return success;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
421 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
422
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
423 void
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
424 PyThread_release_lock(PyThread_type_lock lock)
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
425 {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
426 sem_t *thelock = (sem_t *)lock;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
427 int status, error = 0;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
428
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
429 dprintf(("PyThread_release_lock(%p) called\n", lock));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
430
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
431 status = sem_post(thelock);
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
432 CHECK_STATUS("sem_post");
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
433 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
434
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
435 #else /* USE_SEMAPHORES */
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
436
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
437 /*
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
438 * Lock support.
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
439 */
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
440 PyThread_type_lock
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
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diff changeset
441 PyThread_allocate_lock(void)
1628
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diff changeset
442 {
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443 pthread_lock *lock;
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444 int status, error = 0;
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a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
445
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9290
diff changeset
446 dprintf(("PyThread_allocate_lock called\n"));
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
447 if (!initialized)
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
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diff changeset
448 PyThread_init_thread();
1628
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diff changeset
449
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
450 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
9290
2340f615da8f BSDI specific patches, inspired by Nigel Head and otto@mail.olympus.net.
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parents: 9079
diff changeset
451 memset((void *)lock, '\0', sizeof(pthread_lock));
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diff changeset
452 if (lock) {
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diff changeset
453 lock->locked = 0;
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diff changeset
454
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diff changeset
455 status = pthread_mutex_init(&lock->mut,
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
456 pthread_mutexattr_default);
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
457 CHECK_STATUS("pthread_mutex_init");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
458
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
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diff changeset
459 status = pthread_cond_init(&lock->lock_released,
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diff changeset
460 pthread_condattr_default);
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
461 CHECK_STATUS("pthread_cond_init");
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parents: 1628
diff changeset
462
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
463 if (error) {
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
464 free((void *)lock);
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
465 lock = 0;
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
466 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
467 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
468
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
469 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9290
diff changeset
470 return (PyThread_type_lock) lock;
1628
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diff changeset
471 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
472
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
473 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
474 PyThread_free_lock(PyThread_type_lock lock)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
475 {
1629
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diff changeset
476 pthread_lock *thelock = (pthread_lock *)lock;
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
477 int status, error = 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
478
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
479 dprintf(("PyThread_free_lock(%p) called\n", lock));
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
480
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
481 status = pthread_mutex_destroy( &thelock->mut );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
482 CHECK_STATUS("pthread_mutex_destroy");
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
483
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
484 status = pthread_cond_destroy( &thelock->lock_released );
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diff changeset
485 CHECK_STATUS("pthread_cond_destroy");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
486
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
487 free((void *)thelock);
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
488 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
489
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
490 int
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
491 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
492 {
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
493 int success;
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
494 pthread_lock *thelock = (pthread_lock *)lock;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
495 int status, error = 0;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
496
13210
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Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
497 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
498
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
499 status = pthread_mutex_lock( &thelock->mut );
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parents: 1628
diff changeset
500 CHECK_STATUS("pthread_mutex_lock[1]");
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parents: 1628
diff changeset
501 success = thelock->locked == 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
502
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
503 if ( !success && waitflag ) {
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
504 /* continue trying until we get the lock */
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
505
1629
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
506 /* mut must be locked by me -- part of the condition
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
507 * protocol */
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
508 while ( thelock->locked ) {
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
509 status = pthread_cond_wait(&thelock->lock_released,
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
510 &thelock->mut);
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
511 CHECK_STATUS("pthread_cond_wait");
1628
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512 }
1629
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513 success = 1;
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514 }
28673
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
515 if (success) thelock->locked = 1;
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
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parents: 27320
diff changeset
516 status = pthread_mutex_unlock( &thelock->mut );
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Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
517 CHECK_STATUS("pthread_mutex_unlock[1]");
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Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
518
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Guido van Rossum <guido@python.org>
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diff changeset
519 if (error) success = 0;
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
520 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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521 return success;
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parents:
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522 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
523
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
524 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
525 PyThread_release_lock(PyThread_type_lock lock)
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diff changeset
526 {
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parents: 1628
diff changeset
527 pthread_lock *thelock = (pthread_lock *)lock;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
528 int status, error = 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
529
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
530 dprintf(("PyThread_release_lock(%p) called\n", lock));
1629
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
531
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
532 status = pthread_mutex_lock( &thelock->mut );
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parents: 1628
diff changeset
533 CHECK_STATUS("pthread_mutex_lock[3]");
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Guido van Rossum <guido@python.org>
parents:
diff changeset
534
1629
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
535 thelock->locked = 0;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
536
1629
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
537 status = pthread_mutex_unlock( &thelock->mut );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
538 CHECK_STATUS("pthread_mutex_unlock[3]");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
539
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
540 /* wake up someone (anyone, if any) waiting on the lock */
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
541 status = pthread_cond_signal( &thelock->lock_released );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
542 CHECK_STATUS("pthread_cond_signal");
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Guido van Rossum <guido@python.org>
parents:
diff changeset
543 }
22339
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
544
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
545 #endif /* USE_SEMAPHORES */